Hoist attachment for fork lift trucks



Nov. 7, 1961 M. B. ADAMS HOIST ATTACHMENT FOR FORK LIFT TRUCKS 2 Sheets-Sheet 1 Filed Oct. 29, 1958 INVENTOR MAD/801V 5. ADAM-S ATTORNEYS Nov. 7, 1961 M. B. ADAMS HOIST ATTACHMENT FOR FORK LIFT TRUCKS 2 Sheets-Sheet 2 Filed Oct. 29, 1958 INVENTOR Mw/so/v B ADAMS ATTORNEYS 3,097,592 HOIST ATTACHMENT FUR FORK LIFT TRUQKS Madison B. Adams, Jacksonville, Fla, assignor to Win= frey Brothers, Inc, Knoxville, Tenn, a corporation of Tennessee Filed (Jet. 29, 1958, Ser. No. 770,485 2 Claims. (Cl. 214-620) The present invention relates to hoist attachments for fork lift trucks, and paiticularly to such attachments which can be used without modifying the basic structure of the fork lift truck.

The primary object of the invention is to provide a hoist attachment for fork lift trucks which is supported on and actuated by the lift forks of the fork lift truck.

Another object of the invention is to provide a hoist of the class described above which is longitudinally adjustable to vary the length of the hoist boom.

A further object of the invention is to provide a hoist attachment for fork lift trucks which can be easily attached without the use of tools and is secured thereon by hand operated clamping screws.

A still further object of the invention is to provide a hoist attachment for lift trucks of the class described above which is inexpensive to manufacture, simple to use, and which materially extends the usefulness of the conventional fork lift truck.

Other objects and advantages will become apparent in the following specification when considered in the light of the attached drawings, in which:

FIGURE 1 is a side elevation of the invention shown attached to a fork lift truck, partially broken away for convenience of illustration.

FIGURE 2 is a fragmentary perspective view of the attachment of the cable to the fork lift truck.

FIGURE 3 is a perspective view of the hoist attachment removed from the lift truck.

FIGURE 4 is an enlarged fragmentary vertical section taken along the line 4- of FIGURE 3, looking in the direction of the arrows.

FIGURE 5 is a rear elevation of the hoist attachment removed from the fork lift truck.

Referring now to the drawings in detail wherein like reference characters indicate like parts throughout the several figures, the reference numeral lit indicates generally a hoist attachment for a fork lift truck generally indicated at ll.

The fork lift truck 11 is of the type having a body 12, forward wheels 13, vertical track 1 4, and verically movable carriage 15. The carriage 15 carries a pair of lift forks 16 arranged in spaced parallel relation and verticlly movable with the carriage 15 on the track 14. The fork lift truck 11 is conventional and is the device to which the present invention is attached.

The hoist attachment it includes a pair of spaced parallel longitudinally extending horizontal inverted U- shaped channel members l7, 18 having a transversely extending horizontal inverted U-shaped channel member 19 extending between and connecting the rear ends of the channel members l7, 1.8. A plate 2% extends transversely of the hoist attachment ll underlying the channel members 17, id and the channel member 19, as seen in FIGURES 3 and 5, and secured thereto by welding or the like.

A plate 21 underlies the forward ends of the channel members l7, 18 parallel to the plate 2% and is secured to the channel members 17, 18 by welding or the like. A tubular standard 22 has its lower end secured at 23 centrally of the upper face of the channel member 19 intermediate the channel members 17, 18. The standard 22 is provided with a horizontal integral extension 24 BfihZSdZ Patented Nov. 7, 1961 projecting forwardly from the standard 22 in overlying relation to the plate 21 intermediate the channel members l7, 18.

A pair of spaced parallel ears 25 are secured to the standard 22 at the juncture of the standard 22 with the horizontal extension 24 projecting rearwardly therefrom oppositely of the horizontal extension 24. A sheave 26 is journalled between the cars 25 on a shaft 27, for reasons to be assigned.

A tubular boom 28 is telescopically engaged over the horizontal extension 24-, as best seen in FIGURES l and 3, and is provided with a pair of forwardly extending spaced parallel cars 29 which extend beyond the forward end of the boom 28 and have a sheave 3d journalled therebetween on a shaft 31.

The horizontal extension 24 is provided with a plurality of transversely extending bores 32 and the boom 28 is adjustably secured to the horizontal extension 24 by means of a transversely extending pin 33 extending through the boom 28 and a selected one of the bores 32 in the horizontal extension 24-.

A pair of triangular brace Webs 34, 35 have their perpendicular rear edges 36, 37, respectively, welded to the standard 22 and their horizontal lower edges 33, 39 welded to the channel member 19 and to the channel members 17, 18, respectively. The brace webs 34, 35 extend forwardly and outwardly from the standard 22 to the respective forward outer corners of the channel members 17, 18, respectively.

A hand controlled clamp screw a t? is threaded through the top of the rear end of each of the channel members l7, 18 to engage the lift forks id to clamp the hoist attachment i0 thereto.

A cable ll is trained over the sheaves 26, 30 and has a hook 42 secured to one end thereof for engaging a load to be lifted. The opposite end of the cable 41 is provided with a hook 43 to engage a U-shaped cleat 44 secured to the track 14 at the lower end thereof to secure the cable 41 thereto for ready connection and disconnection.

In the use and operation of the invention, the fork lift truck 11 is operated on a floor 45 and the hook 42 is lowered to an underlying floor (not shown) to lift material therefrom. The hook 42 is engaged with a load to be lifted and the forks R6 of the lift truck 11 are operated in a conventional manner to raise the hoist attachment Ill to the dotted line position shown in FEGURE 1. The action of the hook 4-2 is to raise with respect to the hoist attachment ltl since the opposite end of the cable 41 is securely held by the hook 43 and the cleat 44.

Obviously, the book 42 moves a distance double that of the movement of the hoist attachment 10 so that an appreciable lift can be obtained with the hook 42 without modifying the fork lift truck 11 in any manner. The hoist attachment ltl can be detached from the lift truck 11 by loosening the screws 40 and detaching the hook 43 from the cleat 44 without using tools.

By adjustment of the vertical dimensions of the invention, the device can also be used to raise loads from the Working level of the hoist to higher positions where needed.

Having thus described the preferred embodiment of the invention, it should be understood that numerous structural modifications and adaptations may be resorted to Without departing from the scope of the appended claims.

What is claimed is:

1. A hoist attachment for lift trucks of the fork lift type comprising a horizontal base having means integral ly formed in said base for encompassing the forks of the lift truck, said means including a pair of spaced parallel inverted rectangular channel members, a pair of spaced parallel transversely extending rectangular plates secured to the opposite ends of said channel members, a transversely extending rectangular channel member positioned on one of said plates and secured at its opposite ends to said first said channel members and the surfaces of all of said channel members being in the same plane, a standard secured to said transverse rectangular inverted channel member and projecting perpendicularl upwardly therefrom, a horizontal boom secured to the upper end of said standard.

2. A device as claimed in claim 1 wherein a pair of bracing webs are secured to said standard and to said base extending forwardly and outwardly from said standard to the forward outer corners of said base.

References Cited in the file of this patent UNITED STATES PATENTS Lederer July 10, 1928 Rernde Dec. 22, 1931 Vercoe Aug. 11, 1936 Ulinski Dec. 5, 1944 Benner Dec. 13, 1949 Cirillo Aug. 1, 1950 Shramek Sept. 21, 1954 Bailey Apr. 29, 1958 FOREIGN PATENTS France May 27, 1953 

